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J. Biol. Chem., Vol. 262, Issue 9, 4011-4016, Mar, 1987

recA protein-promoted ATP hydrolysis occurs throughout recA nucleoprotein filaments

SL Brenner, RS Mitchell, SW Morrical, SK Neuendorf, BC Schutte and MM Cox

When recA protein binds cooperatively to single-stranded DNA to form filamentous nucleoprotein complexes, it becomes competent to hydrolyze ATP. No correlation exists between the ends of such complexes and the rate of ATP hydrolysis. ATP hydrolysis is not, therefore, restricted to the terminal subunits on cooperatively bound recA oligomers, but occurs throughout the complex. Similarly, during recA protein-promoted branch migration (during DNA strand exchange), ATP hydrolysis is not restricted to recA protein monomers at the branch point. DNA cofactors of lengths varying from 16 bases to over 12,000 bases support ATP hydrolysis. The maximum value of kcat at infinite DNA concentration is about 29/min independent of the length of the DNA cofactor. The apparent dissociation constant, however, is a strong function of DNA length, providing evidence for a minimum site size of 30-50 bases for efficient binding of recA protein.
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